As a matter of fact, yes it does get its power from the (+)wire of the B/U Light. But if I hook it up to a ACC wire, how's that gonna work with the reverse sensor wire (green), plus having it hooked up to an ACC means that it's gonna reduce the life of the camera because it's gonna be juiced up whenever the car is on even when I'm not using the cam ? Right ? What's ur input on that?
The BU circuit is used for telling your HU that the car is backing-up only. If your HU is configured, itwill switch to the display when BU is energized (depending on settings). It is also used, along with VSS, for dead-reckoning when there is an interruption of sattelite signal. If you also chose to power your camera off your Backup Light circuit, then it will only have power when you are in reverse. In no case does the HU power the camera.
If you want to have the camera operate at other times, you need another power source. If you are concerned about powering it all the time (from ACC), then wire in a manual switch. But I wouldn't worry about the camera being on the ACC circuit (with an inline fuse, of course). It is solid state and will last for many years. The power drain is very small.